What you are asking is actually a very difficult question, and not just because it is on such a specific topic. A thesis is essentially stating what your paper is going to be about so that the reader can easily identify whether or not they should read it. As such, what you are asking is for someone to give you a topic to write about in the area of vestibular and proprioceptive senses (and the teaching thereof to blind children.)
It would be much easier for someone to help you with the thesis if they knew what you wanted to say in your paper. Is there some point that you are trying to make? Are you comparing methods, or evaluating effectiveness?
Here are a few examples. They are a bit general, but not being an expert in the topic they are the best I could do:
1) Though the learning may be difficult, several successful techniques have been developed to improve the vestibular and proprioceptive senses in non-seeing children.
2) In a world in which physical hazards appear in the most innocuous place, the development of the proprioceptive and vestibular senses in blind children can mean more than just an improved quality of life; it can mean the difference between physical safety and peril.
I hope these examples help!